Filter



Oct. 25, 1927.

. F. D. HERBERT FILTER Filed June 19. 1925 Frederfcl' j). Herberz BY fffan'w Iii Patented Oct. 25, 1927.

UNITED STATES 1,646,404 PATENT ori-fics.

FBBDEBIGK D. mBEBT, 0l' UPPER IONTCLAIB, m mi', ASSIGB'OB T0 TAL EDGE FILTER CORPORATION, L. @EPURATION 0F m m.

FILTER.

Applfeatlon lled Jane 19, 1925. Serial lo. 88,160.

This invention relates to filters and particlula'rl to the tvp@ known as edge filters 1n whic the filtration occurs at the edgesof abutting surfaces, withthe filtrate passing between said abutting surfaces.

Such filters comprise a stack of superposed sheets or elements which are spaced apartslightly in a suitable mannen The number of sheets comprising a filteiI of any appreciable `capacit is relatively high, and considerable difficu ty has been experienced in findingy a suitable and relatively inexpensive filtering element or Sheet.

An object 'of the present invention is to provide :in improved edge filter element and method of making the same, which willbe sufficiently durable to withstand contact with moisture; which will withstand high pressures; which will remain chemically inert in the fluids being filtered; which will permit of very close approach of the abutting faces of the sheets forming the filter pack; and which will be suciently inexpensive to be commerciallv feasible.

A further object is to provide an improved method of providing the spacing projections upon filtering sheets which may carried out in quantity production in a simple and inexpensive manner. with accurate c ontrol of the thickness of the spacing projections; and with which the thickness o the spacing projections may be varied to vary the degree of filtration.

Various other objects and advantages -will be ap arent from the following descri tion of a fi ter constructed in accordance wit i the invention, and the novel features will be pnrticularly pointed out in coniiiwtion with the ap ended claims;

n the accompanying drawing:-

Fig. 1 is a sectional elevation of a filter constructed in accordance with the invention;-

Fig. 2 is an elevation-of a portion of the filter pack or unit of the same with the filter sheets slightly spaced apart as when first assemlbled and before they are clamped tot er; geFig. 3 is a similar elevation after the sheets or filter elements have been clamped together and the filtering edges trued; and

Fig. 4 is a transverse section through the u per end of the pack, to show a face of one ci the filter elements or sheets.

In the illustrated embodiment of the in'- vent-ion, an elongated member or spindle 1 is provided with a shoulder 2and a reduced threaded extension 3 which connects with the main spindle body at the shoulder 2. A. flange orplate 4 is passed over the reduced extension 3. and secured against the shoulder 2 by suitable means, such as a washer 5 and a mit 6 which is threaded upon the reduced extension 3. The face of the flange 4, upon the side from which the main body of the spindle extends, is plrovided with an annular groove' 7 in whic a gasket 8 may be disposed, and a tubular casing 9 is fitted at its open end in the groove 7 and against the gasket 8.

The tubular casing may be secured to the flange in anv suitable manner` but as a satisfactory method of attachment a plurality of swing bolts 10 may be hinged at 11 to the casing'and adapted to enter slots 12 in the ovm-hanging riphery of the flange 4. Nuts 13 tlirea ed upon the ends of the bolt and acting against the flange will draw the casing tightly against the-Hangs, the gasket 8 insuring a watertight connection between the flange and casing.

The reduced extension 3 maybe provided with an internal lpaage 14 which extends fromthefreeen oftheextensiontoa point within the body of the spindle 1, and the main body of the spindle 1 is provided with a plurality of passages 15 leading from its (periphery to the passage 14. A pipe 16 lea s from the casing` 9 and may be connected b a union 17 to a pipe 18 which conducts to t ie casing under suitable pressures the liquid to be filtered.

A plurality of filtcielements or sheets 19, snc-li as in the forni of metal sheets or discs, are provided with central a rtures 20 and arranged in su rposed relation face to face to form a pac with the a rtures of the sheets or discs aligned wit one another. The filter elements or discs are fitted over the main body of the spindle 1 by passin the latter through the aligned apertures o tbc sack, and a. plate 2l is fitted over the spin le and against the outer face of the last sheet oi disc so as to confine the sheets or discs together in the pack. A nut 22 is threaded iipoii the projecting end 23 of the spindle. sons to abut against the plate 21 and force the latter toward the flan 4 and adjustably compress the pack of fi ter discs t0- gether and against the flange 4: The nut 22 llll lll

and the late 21 also serve to close the outer end of t passage formed by the ali ed apertures 20 through which the spin e -1 names.

The body part of the spindle 1 which is within the aligned apertures 20 is 0f diiel'- ent cross section from those o the apertures so that there will be one or more channels extending along the spindle 1 und within the aligned apertures 20. The spindle thus serves as o locating, centering or conlining base for the filter peck und since it does not entirely lill the passages 20 aniiiuid in the passages 2l) muy pass ulon t e spindle 1, through the nissages 15, nu thence into the passa 14 oi the reduced extension 3 of the spind e. The casing, at the end opposite from the flange 4, may be closed by e. removable p 24 having a drain or ceoning plug 25. pipe 27 to the end of the threaded extension of the spindle l so as to conduct sway from the passage 14 any liquid collecting iilong the portion of the periphery of thc spindle 1 which is within the pack.

The filtering discs are refernbly formed of metal so as to be capab e of withstandin very liih pressures while in the presence o a liqui und suitable provision must be made for spacing the sheets or discs apart suicienti to provide very fine channels between t e dises. In accordance with this invention, the discs or sheets are spaced apart by adhering projections formed by rinting spacedfigures or designs, upon at east one of each pair of abutting faces of the discs. These printed res or designs are then treated to render em sullciently hard or durable, and to form an adherent part of the disc upon which they are printed.

As n speciic desired type such as spaced dots 28 may be printed upon a face of s thin hardened e russ sheet, the usual lithographing process bein suitable. The metal however, should be t oroughly cleaned heiore the printing o ration, und this cleaning nia be itcconiished by any well known met iod, such `:is Ey an vacid bath, but preferabl by electiolytic cleaning. The metal. eet is then passed through a metal press of any one of a number of di erent types, such as the full roller, or half roller for example, and while pnssin through the press, the desired design w' be printed upon a foce of the sheet. A suitab e ink for the purpose is one including mercurio oxide, linseed oil, e litho-varnish and parallin.

When the sheet is issued from the press with the design freshly printed thereon, the

printed foce is dusted w1th a suitable muterial, such us powdered asphaltum. The

sheets are then placed in an oven and baked until the ink and esphaltum are thoroughly dried. For example, the temperature o the 26 may be connected by a union exemple, a design of any' operation muy he at approximately baking* 350 During the baking recess the as lialtum melts and unites with the ink wiich has been soitenedby the heat, and

the two are 'liniilly dried into abord eomhold the filtering discs npui't the desired distance. when the li-.sign islpriuted upon sheets of large uren, the sheets are subscqueiitly stam l or cut lo the desired shape :uid size, ut by reason of such stemping operations the edges will not be absolutely rfect, as shown in Fig. 2, und the slight edges thus formed between the edges of abutting sheets are iuidnesiruhle, since the retention of the separated particles nt the edgm of the discs causes im obstruction tc the free flow of the Huid which is undesirable. In order te prevent this obstruction, the puck {ilter after being assembled and vonipiessed as shown in Fig. 1 is trued up in e .suitable manner, such as by turning ed the periphery of the puck, in which case n wry', smooth regular outer surface of the puc will be provided, to which the purticles will not adhere in an u 'precinble quantity. Any such particles w zic do adhere may he readily removed' by brushing, or by swishing the pack through a cleaning liquid.

Flic spaced dots or other ligures hold the feces of the discs spaced sucientl to provide minute channels through w lich the lliiid only' passes, while the particles iii suspension ein which are lai' r than the chenl nel depths nre mechanical y retained et the outer peripheral surfaces of the pack. The formation of the spacing projections by the priutin f process described is relatively [simple uni inexpensive, and u very satisfactory und durable filter is obtained thereby.

Such a process of providing the dime with projections eatly assists quantity production of the ter. It will be understood that various changes in the details, materials, and various steps which have been herein described and illustrated in order to explain the nature of the invention, may be made by those skilled in the art within the principle and scope of the invention ns expressed in the appended claims.

1. In an edge filter, a filter element of sheet metalhaving adherent non-metalli(- spacing proJections formed thereon.

2. In un edge filter, a filter pack com -prising a plurality of superposed filter eleluf.

llll

ments of sheet metal, a pluralit7 of said elements having adherent non-metallic spacing projections formed thereon for spacing slightly apart the elements of the pack.

3. In an edge filter, a filter element of sheet metal having small spacing projections upon a face thereof, said projeetionscomprising an adherent printe'd and hardened design having channels between the figures of the design.

4. In an edge/filter, a lter element of sheet metal having a printed design of spaced figures upon a face thereof, the matcrial of the printed design comprising a parain base hardened thereon subsequent to the printing.

In an edge filter, a filter element of sheet heat resisting material having a fused printed design of spaced figures baked thereon to forni spacing projections.

6. In an edge filter, a filtering element of sheet heat resisting material having a fused printed design of spaced figures, containingr a form of asphaltum, the design having channels between the figures thereof to form closed channels between the superposed f iltering sheets.

7. The process of producing filtering elements for edge filters which comprises printing upon a face of one ofeach pair of abutting faces of the elements, a design of spaced figures, then treating the elements to harden the material forming the design.

8. The process of forming filtering elements for edge filters which comprises printing a design of spaced figures upon a face of a filtering element, dusting the freshly printed design with powdered asphaltum,

and then heating the sheet with the dusted design until the asphaltum is fused and hardened.

9. The process of forming filtering elements for edge filters which comprises printing a design having channels between the figures thereof upon a face of a filter element, and then treating the printed element to harden the design.

10. The process of forming filtering elements for edge filters which comprises printingr a design of spaced figures upon a face of an element by a suitable lithographing process, and then treating the element to harden the design.

1l. The process of forming filtering elements for edge filters which comprises printing a design of spaced figures upon a faceof an element by a suitable lithographing proceis1 dusting the freshly printed design with powdered asphaltuni. and then heating the element to fuse and harden the asphaltum which adheres lo the design.

12. In the manufacture of filtering elements for edge filters, the step which com-i prises lithographing' a design of spaced figures upon a. face of a filter element to provide spacing projections.

In witness whereof, I hereunto subscribe my signature.

FREDERICK D. HERBERT.

isisk ments of sheet metal, a plurality of said elements having adherent non-metallic spacing projections formed thereon for spacing slightly apart the elements of the pack.

3. In an edge filter, a filter element of sheet metal having small spacing projections upon a face thereof, said projections comprising an adherent printed and hardened design having channels between the figures of the design.

4. In an edge "filter, a` filter element of sheet metal having a printed design of spaced figures upon a face thereof, the materinl of the printed design comprising a paraffin base hardened thereon subsequent to the printing.

5. In an edge filter, a filter element of sheet heat resisting material having a fused printed design of spaced figures baked thereon to form spacing projections.

6. In an edge filter. a filtering element of sheet heat resisting material having a fused printed design of spaced figures, containing a form of asphaltum. the design having channels between the figures thereof to form closed channels between the supcrposcd filtering sheets.

7. The process of producing filtering clelments for edge filters which comprises printing upon a face of one ofzeach pair of abutting faces of the elements, a design of spaced figures, then treating the elements to harden the material forming the design.

8. The process of forming filtering elements for edge filters which comprises printing a design of spaced figures u on a face of a filtering element, dusting t e freshly printed design with powdered asphaltuin, and then heating the sheet with the dusted design until the asphaltum is fused and hardened.

9. The process of forming filtering elements for edge filters which comprises printin; a design having channels between the figures thereof upon a face of a filter element, and then treating the printed element to harden the design.

10. The process of forming filtering elements for edge filters which comprises printing a design of spaced figures upon a face of an element by a suitable lithographing process,` and then treating the element to harden the design.

1l. The process of forming filtering elements for edge filters which comprises printing a design of spaced figures upon a faceof an element by a suitable lifhographing proeefs, dusting the freshly printed design with powdered aspluiltum. and then heating the element to fuse and harden the asphaltum which adheres to the design.

l2. In the nmnufacture of filtering elements for edge filters, the step which com-i prises lithographing' a design of spaced figures upon a face of a filter element to provide spacing projections.

In witness whereof, I hereunto subscribe my signature.

FREDERICK D. HERBERT.

DISCLAIMER Reliance-Emma October 25, 1927. Disclaimer Patent dated 13, 1930, by the assignee by mesne assignments Keaiyott Engineering Company, Inc.

Hereby enters this Words, to wit:

disclaimer to claim 12 of said patent, which is in the following 12. In the manufacture of filtering elements for edge filters, the step which comprises lithographing a design of' spaced figures upon a face of a filter element to provide spacing projections.

[Oficial Gazette June-3, 1930.]

DISCLAIMER 1,646,404.-Frederz'ck D. Herbert, Upper Montclair, N. J. FILTER. Patent dated `October 25, 1927. Disclaimer` filed May 13, 1930, by the assignee by mesme assignments, Kearjott Engineering Company, Inc. p A Hereby enters this disclaimer to claim 12 of said pnten t, which is in the following words, to wit:

12. In the manufacture of filtering elements for edge filters, the step which comprises lithographing a. design of spaced figures upon a fece of a lter element to provide spacing projections. i

[Qpm'ez Gazette June 3, 1930.] 

